I am getting an stack overflow when the program tries to add a number. It seems to be accessing a nonexistent binary search tree. Here is the error code: Unhandled exception at 0x01084DD9 in CIS 350 question 2.exe: 0xC0000005: Access violation reading location 0xCDCDCDD5. Can someone please help? Thanks in advance!

```
#include <iostream>
#include <algorithm> // for permutations
using namespace std;
struct BST
{
BST* left;
BST* right;
int d;
BST(int data)
{
d = data;
BST* left;
BST* right;
cout << d << endl;
}
void add(int data)
{
cout << d << " | " << data << endl;
if (d < data){
if (right == NULL){
right = new BST(data);
}
else{
right->add(data);
}
}
else{
if (left == NULL){
left = new BST(data);
}
else{
left->add(data);
}
}
}
}
int main()
{
BST* test1 = new BST(12);
test1->add(14);
system("pause");
return 0;
}
```

As pointed out by AlexD in comments, the segmentation fault arises from the fact that `struct BST`

members `left`

and `right`

are not initialized to `NULL`

.

Note that this is hinted by the error which indicates "Access violation reading location 0xCDCDCDD5". Location 0xCDCDCDCD, when using Microsoft C++ runtime library is a magic number which marks uninitialized memory.

Location 0xCDCDCDD5 (8 byte offset from 0xCDCDCDCD) arises as the code `left->add(data)`

attempts to write in member `left->d`

(8 byte offset from the location pointed to by `left`

).

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